Add a dump of the checklist I use when delivering

CHECKLIST.md

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+This is the checklist that I (Jérôme) use when delivering a workshop.
+
+- [ ] Create branch + `_redirects` + push to GitHub + Netlify setup
+- [ ] Add branch to index.html
+- [ ] Update the slides that says which versions we are using
+- [ ] Update the version of Compose and Machine in settings
+- [ ] Create chatroom
+- [ ] Set chatroom in YML and deploy
+- [ ] Put chat room in index.html
+- [ ] Walk the room to count seats, check power supplies, lectern, A/V setup
+- [ ] How many VMs do we need?
+- [ ] Provision VMs
+- [ ] Print cards
+- [ ] Cut cards
+- [ ] Last minute merge from master
+- [ ] Check that all looks good
+- [ ] DELIVER!
+- [ ] Shutdown VMs
+- [ ] Update index.html to remove chat link and move session to past things